Advanced Excel Essentials - download pdf or read online

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desk of Contents

Take the seemingly complex formula shown in Listing 3-1. 31 Chapter 3 ■ Introducing Formula Concepts Listing 3-1. ")) Let’s say you want to evaluate only a part of this formula, specifically the highlighted portion of the same formula but now in Excel’s formula bar (Figure 3-1). Figure 3-1. You can select a portion of the formula to be evaluated immediately In fact, you can tell Excel to evaluate just that easily. If you highlight the portion as I’ve done in Figure 3-1, you can press F9 to see what it evaluates to (see Figure 3-2).

Alternatively, I can just say something like A2:A1000, where the second range is an arbitrarily large number. Neither the former’s formula reapplication nor the latter’s arbitrarily high number are very good fixes. The best solution is to use a dynamically sized range. To do this with the INDEX formula, you can write =$A$2:INDEX($A:$A,COUNTA($A:$A)) like in Figure 3-6. Figure 3-6. A demonstration of the formula that will ultimately help you create a dynamically sized range Here’s how it works. You supply the entire column range A:A to the INDEX formula.

In the example above, when index_num is 1, value1 is returned; when index_num is 2, value2 is returned, and so forth. In the previous instance, you could simply write =CHOOSE(A2, "Small", "Med", "Large"). This appears to be more closely align with the way this example is naturally formulated. Because of this, CHOOSE makes the data arrangement more easy to read and understand at first glance. Compare the two arrangements: IF arrangement =IF(A2=1, "Small",IF(A2=2,"Med", "Large")). CHOOSE arrangement =CHOOSE(A2, "Small", "Med", "Large") GENERATING RANDOM DATA WITH CHOOSE( ) CHOOSE is also great for generating random categorical or nominal data.